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Previously, these metrics were loaded on the UI thread which, because
they are in a memory-mapped file, can cause blocking I/O and cause
jank.

Bug: 882892
Change-Id: I23b1808b5233b5bd05a1dbe5e96ace32c73ef46b
Reviewed-on: https://chromium-review.googlesource.com/c/1292271
Commit-Queue: Brian White <bcwhite@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Reviewed-by: François Doray <fdoray@chromium.org>
Cr-Commit-Position: refs/heads/master@{#602968}